It is a promising direction to develop photovoltaic industry for its clean and renewablecharacteristics. Solar cell is the core of the photovoltaic industry, which faces two bigproblems: high cost and low efficiency. Surface microstructures can be used as light-trappingstructure for solar cells to improve the efficiency. This thesis does researches and analysis ofone-dimensional (1D) and two-dimensional (2D) silicon gratings as absorbers for solar cellsto enhance absorption of sunlight in the visible and ne...